Trolling line sinker



April 6, 1938. E. CHOCHARD 2,115,302

TROLLING LINE SINKER Filed Jan. 8, 1956 Eda/a 71/ C'fioC/fa raf PatentedApr. 26, 1938 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to improvements in trolling line sinkers of thattype which are of light weight and have means on which the water reactsto carry the sinker and its attached bait line down to the depthrequired for deep water fishmg.

The primary object of the present invention is to provide a trollingline sinker of the above type which is extremely simple in construction,economical to manufacture, and eflicient in use.

The present invention particularly resides in the novel construction andform of sinker hereinafter more fully described, shown in theaccompanying drawing and claimed.

In the drawing:

Figure 1 is a side elevation of a sinker embodying the presentinvention, with the trolling line and bait line connected thereto.

Figure 2 is an enlarged top plan view of the sinker shown in Figure 1.

Figure 3 is a bottom plan view thereof.

Figure 4 is an end elevation looking toward the right of Figure 2.

Figure 5 is a longitudinal section taken on the plane of 5-5 of Figure2.

Referring in detail to the drawing, the present sinker is of a Weightonly sufficient to insure that it will be fully immersed, and consistsof a relatively small elongated body 5 that is tapered longitudinallyand provided at its smaller extreme rear end with an eye 6 to facilitateconnection of the bait line 1 to the sinker. The sinker body 5 is alsoprovided on its upper side and directly at its front larger end with asecond eye 8 to facilitate connection of the trolling line 9 to thesinker. At its larger forward end, the sinker body 5 is provided with anintegral flattened head l0 whose upper surface I I is inclined forwardlyand downwardly and is of substantially aerofoil form. Also, theflattened head I0 is laterally enlarged to project symmetrically fromeach side of the body 5 and provide relatively short lateral wingportions whose upper and under surfaces are alsoinclined forwardly anddownwardly and are of substantially aerofoil form.

As this headed and winged body is drawn through the water by itstrolling line 9, the weight of such body will initially carry it belowthe surface, and the reaction of the water on the inclined surface IIwill cause the front end of the body 5 to be directed downwardly. Thesinker is thus drawn down deeper into the water against the upward pullof the line 9, and this downward movement will continue until thetension of the trolling line 9 and the drag of the bait line 1 overcomethe water pressure reacting on the surface ll. Due to the substantiallyaerofoil form of the surfaces II and I3, resistance to forward movementof the sinker through the water is reduced to a minimum.

It will be seen that I have provided a very simple one-piece sinkerwhich may be economically cast to include the inclined head with itsinclined wing portions. No attachment of separate vanes is required, andthe wing portions of the head are not likely to readily get caught insubmarine weeds because of the relatively thick and short form of suchwings. The eyes 6 and 8 may be readily attached to the sinker when it iscast, and the finished device will be found to operate efliciently forthe intended purpose.

It will be noted that the aerofoil surfaces H and I3 are specifically ofthe type known as aero-curve surfaces, or which are so scientific- 0ally curved as to provide maximum submerging power and minimumresistance to forward movement of the sinker through the water. As iswell known, similar surfaces are provided for the wings or planes ofaeroplanes to provide 25 maximum sustaining or lifting power andminimlun resistance to forward travel.

What I claim as new is:

1. A trolling line sinker comprising an elongated longitudinally taperedbody having means at its extreme rear smaller end for connecting it tothe bait line and means directly at its forward larger end forconnecting the trolling line to the upper side thereof, said body havingan integral laterally enlarged head on its larger forward end providedwith a forwardly and downwardly inclined convex upper surface ofaerocurve form. V

2. A trolling line sinker comprising an elongated longitudinally taperedbody having means at its extreme rear smaller end for connecting it tothe bait line and means directly at its forward larger end forconnecting the trolling line to the upper side thereof, said body havingan integral laterally enlarged head on its larger 45 forward endinclined forwardly and downwardly, said head being laterally enlarged toproject symmetrically from each side of the body in the form ofrelatively short forwardly and downwardly inclined laterally; projectingwing por- 50 tions, the upper surfaces of the head and the wing portionsbeing coincident and of aero-curve form.

3. A trolling line sinker comprising an elongated longitudinally taperedbody having means 55 metrically from each side of the body in the formof relatively short wing portions having convex forwardly and downwardlyinclined upper and under surfaces, said surfaces being of aerocurveform.

EDWARD CHOCHARD.

